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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import collections
import itertools
import re
from ._structures import Infinity, NegativeInfinity
from ._typing import TYPE_CHECKING
if TYPE_CHECKING: # pragma: no cover
from typing import Callable, Iterator, List, Optional, SupportsInt, Tuple, Union
from ._structures import InfinityType, NegativeInfinityType
InfiniteTypes = Union[InfinityType, NegativeInfinityType]
PrePostDevType = Union[InfiniteTypes, Tuple[str, int]]
SubLocalType = Union[InfiniteTypes, int, str]
LocalType = Union[
NegativeInfinityType,
Tuple[
Union[
SubLocalType,
Tuple[SubLocalType, str],
Tuple[NegativeInfinityType, SubLocalType],
],
...,
],
]
CmpKey = Tuple[
int, Tuple[int, ...], PrePostDevType, PrePostDevType, PrePostDevType, LocalType
]
LegacyCmpKey = Tuple[int, Tuple[str, ...]]
VersionComparisonMethod = Callable[
[Union[CmpKey, LegacyCmpKey], Union[CmpKey, LegacyCmpKey]], bool
]
__all__ = ["parse", "Version", "LegacyVersion", "InvalidVersion", "VERSION_PATTERN"]
_Version = collections.namedtuple(
"_Version", ["epoch", "release", "dev", "pre", "post", "local"]
)
def parse(version):
# type: (str) -> Union[LegacyVersion, Version]
"""
Parse the given version string and return either a :class:`Version` object
or a :class:`LegacyVersion` object depending on if the given version is
a valid PEP 440 version or a legacy version.
"""
try:
return Version(version)
except InvalidVersion:
return LegacyVersion(version)
class InvalidVersion(ValueError):
"""
An invalid version was found, users should refer to PEP 440.
"""
class _BaseVersion(object):
_key = None # type: Union[CmpKey, LegacyCmpKey]
def __hash__(self):
# type: () -> int
return hash(self._key)
def __lt__(self, other):
# type: (_BaseVersion) -> bool
return self._compare(other, lambda s, o: s < o)
def __le__(self, other):
# type: (_BaseVersion) -> bool
return self._compare(other, lambda s, o: s <= o)
def __eq__(self, other):
# type: (object) -> bool
return self._compare(other, lambda s, o: s == o)
def __ge__(self, other):
# type: (_BaseVersion) -> bool
return self._compare(other, lambda s, o: s >= o)
def __gt__(self, other):
# type: (_BaseVersion) -> bool
return self._compare(other, lambda s, o: s > o)
def __ne__(self, other):
# type: (object) -> bool
return self._compare(other, lambda s, o: s != o)
def _compare(self, other, method):
# type: (object, VersionComparisonMethod) -> Union[bool, NotImplemented]
if not isinstance(other, _BaseVersion):
return NotImplemented
return method(self._key, other._key)
class LegacyVersion(_BaseVersion):
def __init__(self, version):
# type: (str) -> None
self._version = str(version)
self._key = _legacy_cmpkey(self._version)
def __str__(self):
# type: () -> str
return self._version
def __repr__(self):
# type: () -> str
return "<LegacyVersion({0})>".format(repr(str(self)))
@property
def public(self):
# type: () -> str
return self._version
@property
def base_version(self):
# type: () -> str
return self._version
@property
def epoch(self):
# type: () -> int
return -1
@property
def release(self):
# type: () -> None
return None
@property
def pre(self):
# type: () -> None
return None
@property
def post(self):
# type: () -> None
return None
@property
def dev(self):
# type: () -> None
return None
@property
def local(self):
# type: () -> None
return None
@property
def is_prerelease(self):
# type: () -> bool
return False
@property
def is_postrelease(self):
# type: () -> bool
return False
@property
def is_devrelease(self):
# type: () -> bool
return False
_legacy_version_component_re = re.compile(r"(\d+ | [a-z]+ | \.| -)", re.VERBOSE)
_legacy_version_replacement_map = {
"pre": "c",
"preview": "c",
"-": "final-",
"rc": "c",
"dev": "@",
}
def _parse_version_parts(s):
# type: (str) -> Iterator[str]
for part in _legacy_version_component_re.split(s):
part = _legacy_version_replacement_map.get(part, part)
if not part or part == ".":
continue
if part[:1] in "0123456789":
# pad for numeric comparison
yield part.zfill(8)
else:
yield "*" + part
# ensure that alpha/beta/candidate are before final
yield "*final"
def _legacy_cmpkey(version):
# type: (str) -> LegacyCmpKey
# We hardcode an epoch of -1 here. A PEP 440 version can only have a epoch
# greater than or equal to 0. This will effectively put the LegacyVersion,
# which uses the defacto standard originally implemented by setuptools,
# as before all PEP 440 versions.
epoch = -1
# This scheme is taken from pkg_resources.parse_version setuptools prior to
# it's adoption of the packaging library.
parts = [] # type: List[str]
for part in _parse_version_parts(version.lower()):
if part.startswith("*"):
# remove "-" before a prerelease tag
if part < "*final":
while parts and parts[-1] == "*final-":
parts.pop()
# remove trailing zeros from each series of numeric parts
while parts and parts[-1] == "00000000":
parts.pop()
parts.append(part)
return epoch, tuple(parts)
# Deliberately not anchored to the start and end of the string, to make it
# easier for 3rd party code to reuse
VERSION_PATTERN = r"""
v?
(?:
(?:(?P<epoch>[0-9]+)!)? # epoch
(?P<release>[0-9]+(?:\.[0-9]+)*) # release segment
(?P<pre> # pre-release
[-_\.]?
(?P<pre_l>(a|b|c|rc|alpha|beta|pre|preview))
[-_\.]?
(?P<pre_n>[0-9]+)?
)?
(?P<post> # post release
(?:-(?P<post_n1>[0-9]+))
|
(?:
[-_\.]?
(?P<post_l>post|rev|r)
[-_\.]?
(?P<post_n2>[0-9]+)?
)
)?
(?P<dev> # dev release
[-_\.]?
(?P<dev_l>dev)
[-_\.]?
(?P<dev_n>[0-9]+)?
)?
)
(?:\+(?P<local>[a-z0-9]+(?:[-_\.][a-z0-9]+)*))? # local version
"""
class Version(_BaseVersion):
_regex = re.compile(r"^\s*" + VERSION_PATTERN + r"\s*$", re.VERBOSE | re.IGNORECASE)
def __init__(self, version):
# type: (str) -> None
# Validate the version and parse it into pieces
match = self._regex.search(version)
if not match:
raise InvalidVersion("Invalid version: '{0}'".format(version))
# Store the parsed out pieces of the version
self._version = _Version(
epoch=int(match.group("epoch")) if match.group("epoch") else 0,
release=tuple(int(i) for i in match.group("release").split(".")),
pre=_parse_letter_version(match.group("pre_l"), match.group("pre_n")),
post=_parse_letter_version(
match.group("post_l"), match.group("post_n1") or match.group("post_n2")
),
dev=_parse_letter_version(match.group("dev_l"), match.group("dev_n")),
local=_parse_local_version(match.group("local")),
)
# Generate a key which will be used for sorting
self._key = _cmpkey(
self._version.epoch,
self._version.release,
self._version.pre,
self._version.post,
self._version.dev,
self._version.local,
)
def __repr__(self):
# type: () -> str
return "<Version({0})>".format(repr(str(self)))
def __str__(self):
# type: () -> str
parts = []
# Epoch
if self.epoch != 0:
parts.append("{0}!".format(self.epoch))
# Release segment
parts.append(".".join(str(x) for x in self.release))
# Pre-release
if self.pre is not None:
parts.append("".join(str(x) for x in self.pre))
# Post-release
if self.post is not None:
parts.append(".post{0}".format(self.post))
# Development release
if self.dev is not None:
parts.append(".dev{0}".format(self.dev))
# Local version segment
if self.local is not None:
parts.append("+{0}".format(self.local))
return "".join(parts)
@property
def epoch(self):
# type: () -> int
_epoch = self._version.epoch # type: int
return _epoch
@property
def release(self):
# type: () -> Tuple[int, ...]
_release = self._version.release # type: Tuple[int, ...]
return _release
@property
def pre(self):
# type: () -> Optional[Tuple[str, int]]
_pre = self._version.pre # type: Optional[Tuple[str, int]]
return _pre
@property
def post(self):
# type: () -> Optional[Tuple[str, int]]
return self._version.post[1] if self._version.post else None
@property
def dev(self):
# type: () -> Optional[Tuple[str, int]]
return self._version.dev[1] if self._version.dev else None
@property
def local(self):
# type: () -> Optional[str]
if self._version.local:
return ".".join(str(x) for x in self._version.local)
else:
return None
@property
def public(self):
# type: () -> str
return str(self).split("+", 1)[0]
@property
def base_version(self):
# type: () -> str
parts = []
# Epoch
if self.epoch != 0:
parts.append("{0}!".format(self.epoch))
# Release segment
parts.append(".".join(str(x) for x in self.release))
return "".join(parts)
@property
def is_prerelease(self):
# type: () -> bool
return self.dev is not None or self.pre is not None
@property
def is_postrelease(self):
# type: () -> bool
return self.post is not None
@property
def is_devrelease(self):
# type: () -> bool
return self.dev is not None
@property
def major(self):
# type: () -> int
return self.release[0] if len(self.release) >= 1 else 0
@property
def minor(self):
# type: () -> int
return self.release[1] if len(self.release) >= 2 else 0
@property
def micro(self):
# type: () -> int
return self.release[2] if len(self.release) >= 3 else 0
def _parse_letter_version(
letter, # type: str
number, # type: Union[str, bytes, SupportsInt]
):
# type: (...) -> Optional[Tuple[str, int]]
if letter:
# We consider there to be an implicit 0 in a pre-release if there is
# not a numeral associated with it.
if number is None:
number = 0
# We normalize any letters to their lower case form
letter = letter.lower()
# We consider some words to be alternate spellings of other words and
# in those cases we want to normalize the spellings to our preferred
# spelling.
if letter == "alpha":
letter = "a"
elif letter == "beta":
letter = "b"
elif letter in ["c", "pre", "preview"]:
letter = "rc"
elif letter in ["rev", "r"]:
letter = "post"
return letter, int(number)
if not letter and number:
# We assume if we are given a number, but we are not given a letter
# then this is using the implicit post release syntax (e.g. 1.0-1)
letter = "post"
return letter, int(number)
return None
_local_version_separators = re.compile(r"[\._-]")
def _parse_local_version(local):
# type: (str) -> Optional[LocalType]
"""
Takes a string like abc.1.twelve and turns it into ("abc", 1, "twelve").
"""
if local is not None:
return tuple(
part.lower() if not part.isdigit() else int(part)
for part in _local_version_separators.split(local)
)
return None
def _cmpkey(
epoch, # type: int
release, # type: Tuple[int, ...]
pre, # type: Optional[Tuple[str, int]]
post, # type: Optional[Tuple[str, int]]
dev, # type: Optional[Tuple[str, int]]
local, # type: Optional[Tuple[SubLocalType]]
):
# type: (...) -> CmpKey
# When we compare a release version, we want to compare it with all of the
# trailing zeros removed. So we'll use a reverse the list, drop all the now
# leading zeros until we come to something non zero, then take the rest
# re-reverse it back into the correct order and make it a tuple and use
# that for our sorting key.
_release = tuple(
reversed(list(itertools.dropwhile(lambda x: x == 0, reversed(release))))
)
# We need to "trick" the sorting algorithm to put 1.0.dev0 before 1.0a0.
# We'll do this by abusing the pre segment, but we _only_ want to do this
# if there is not a pre or a post segment. If we have one of those then
# the normal sorting rules will handle this case correctly.
if pre is None and post is None and dev is not None:
_pre = NegativeInfinity # type: PrePostDevType
# Versions without a pre-release (except as noted above) should sort after
# those with one.
elif pre is None:
_pre = Infinity
else:
_pre = pre
# Versions without a post segment should sort before those with one.
if post is None:
_post = NegativeInfinity # type: PrePostDevType
else:
_post = post
# Versions without a development segment should sort after those with one.
if dev is None:
_dev = Infinity # type: PrePostDevType
else:
_dev = dev
if local is None:
# Versions without a local segment should sort before those with one.
_local = NegativeInfinity # type: LocalType
else:
# Versions with a local segment need that segment parsed to implement
# the sorting rules in PEP440.
# - Alpha numeric segments sort before numeric segments
# - Alpha numeric segments sort lexicographically
# - Numeric segments sort numerically
# - Shorter versions sort before longer versions when the prefixes
# match exactly
_local = tuple(
(i, "") if isinstance(i, int) else (NegativeInfinity, i) for i in local
)
return epoch, _release, _pre, _post, _dev, _local
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